2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
36 #define IEEE80211_TX_OK 0
37 #define IEEE80211_TX_AGAIN 1
38 #define IEEE80211_TX_PENDING 2
42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
45 int rate, mrate, erp, dur, i;
46 struct ieee80211_rate *txrate;
47 struct ieee80211_local *local = tx->local;
48 struct ieee80211_supported_band *sband;
49 struct ieee80211_hdr *hdr;
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
52 /* assume HW handles this */
53 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
57 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
60 sband = local->hw.wiphy->bands[tx->channel->band];
61 txrate = &sband->bitrates[info->control.rates[0].idx];
63 erp = txrate->flags & IEEE80211_RATE_ERP_G;
66 * data and mgmt (except PS Poll):
68 * - during contention period:
69 * if addr1 is group address: 0
70 * if more fragments = 0 and addr1 is individual address: time to
71 * transmit one ACK plus SIFS
72 * if more fragments = 1 and addr1 is individual address: time to
73 * transmit next fragment plus 2 x ACK plus 3 x SIFS
76 * - control response frame (CTS or ACK) shall be transmitted using the
77 * same rate as the immediately previous frame in the frame exchange
78 * sequence, if this rate belongs to the PHY mandatory rates, or else
79 * at the highest possible rate belonging to the PHY rates in the
82 hdr = (struct ieee80211_hdr *)tx->skb->data;
83 if (ieee80211_is_ctl(hdr->frame_control)) {
84 /* TODO: These control frames are not currently sent by
85 * mac80211, but should they be implemented, this function
86 * needs to be updated to support duration field calculation.
88 * RTS: time needed to transmit pending data/mgmt frame plus
89 * one CTS frame plus one ACK frame plus 3 x SIFS
90 * CTS: duration of immediately previous RTS minus time
91 * required to transmit CTS and its SIFS
92 * ACK: 0 if immediately previous directed data/mgmt had
93 * more=0, with more=1 duration in ACK frame is duration
94 * from previous frame minus time needed to transmit ACK
96 * PS Poll: BIT(15) | BIT(14) | aid
102 if (0 /* FIX: data/mgmt during CFP */)
103 return cpu_to_le16(32768);
105 if (group_addr) /* Group address as the destination - no ACK */
108 /* Individual destination address:
109 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
110 * CTS and ACK frames shall be transmitted using the highest rate in
111 * basic rate set that is less than or equal to the rate of the
112 * immediately previous frame and that is using the same modulation
113 * (CCK or OFDM). If no basic rate set matches with these requirements,
114 * the highest mandatory rate of the PHY that is less than or equal to
115 * the rate of the previous frame is used.
116 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
119 /* use lowest available if everything fails */
120 mrate = sband->bitrates[0].bitrate;
121 for (i = 0; i < sband->n_bitrates; i++) {
122 struct ieee80211_rate *r = &sband->bitrates[i];
124 if (r->bitrate > txrate->bitrate)
127 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
130 switch (sband->band) {
131 case IEEE80211_BAND_2GHZ: {
133 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
134 flag = IEEE80211_RATE_MANDATORY_G;
136 flag = IEEE80211_RATE_MANDATORY_B;
141 case IEEE80211_BAND_5GHZ:
142 if (r->flags & IEEE80211_RATE_MANDATORY_A)
145 case IEEE80211_NUM_BANDS:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Time needed to transmit ACK
157 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
158 * to closest integer */
160 dur = ieee80211_frame_duration(local, 10, rate, erp,
161 tx->sdata->vif.bss_conf.use_short_preamble);
164 /* Frame is fragmented: duration increases with time needed to
165 * transmit next fragment plus ACK and 2 x SIFS. */
166 dur *= 2; /* ACK + SIFS */
168 dur += ieee80211_frame_duration(local, next_frag_len,
169 txrate->bitrate, erp,
170 tx->sdata->vif.bss_conf.use_short_preamble);
173 return cpu_to_le16(dur);
176 static int inline is_ieee80211_device(struct ieee80211_local *local,
177 struct net_device *dev)
179 return local == wdev_priv(dev->ieee80211_ptr);
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
186 struct ieee80211_local *local = tx->local;
187 struct ieee80211_if_managed *ifmgd;
189 /* driver doesn't support power save */
190 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
193 /* hardware does dynamic power save */
194 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
197 /* dynamic power save disabled */
198 if (local->hw.conf.dynamic_ps_timeout <= 0)
201 /* we are scanning, don't enable power save */
205 if (!local->ps_sdata)
208 /* No point if we're going to suspend */
209 if (local->quiescing)
212 /* dynamic ps is supported only in managed mode */
213 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
216 ifmgd = &tx->sdata->u.mgd;
219 * Don't wakeup from power save if u-apsd is enabled, voip ac has
220 * u-apsd enabled and the frame is in voip class. This effectively
221 * means that even if all access categories have u-apsd enabled, in
222 * practise u-apsd is only used with the voip ac. This is a
223 * workaround for the case when received voip class packets do not
224 * have correct qos tag for some reason, due the network or the
227 * Note: local->uapsd_queues access is racy here. If the value is
228 * changed via debugfs, user needs to reassociate manually to have
229 * everything in sync.
231 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
232 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
233 && skb_get_queue_mapping(tx->skb) == 0)
236 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
237 ieee80211_stop_queues_by_reason(&local->hw,
238 IEEE80211_QUEUE_STOP_REASON_PS);
239 ieee80211_queue_work(&local->hw,
240 &local->dynamic_ps_disable_work);
243 mod_timer(&local->dynamic_ps_timer, jiffies +
244 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
249 static ieee80211_tx_result debug_noinline
250 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
253 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
254 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
257 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
260 if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) &&
261 !ieee80211_is_probe_req(hdr->frame_control) &&
262 !ieee80211_is_nullfunc(hdr->frame_control))
264 * When software scanning only nullfunc frames (to notify
265 * the sleep state to the AP) and probe requests (for the
266 * active scan) are allowed, all other frames should not be
267 * sent and we should not get here, but if we do
268 * nonetheless, drop them to avoid sending them
269 * off-channel. See the link below and
270 * ieee80211_start_scan() for more.
272 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
276 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
279 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
282 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
285 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
287 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
288 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
289 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
290 ieee80211_is_data(hdr->frame_control))) {
291 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
292 printk(KERN_DEBUG "%s: dropped data frame to not "
293 "associated station %pM\n",
294 tx->sdata->name, hdr->addr1);
295 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
296 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
300 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
301 tx->local->num_sta == 0 &&
302 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
304 * No associated STAs - no need to send multicast
315 /* This function is called whenever the AP is about to exceed the maximum limit
316 * of buffered frames for power saving STAs. This situation should not really
317 * happen often during normal operation, so dropping the oldest buffered packet
318 * from each queue should be OK to make some room for new frames. */
319 static void purge_old_ps_buffers(struct ieee80211_local *local)
321 int total = 0, purged = 0;
323 struct ieee80211_sub_if_data *sdata;
324 struct sta_info *sta;
327 * virtual interfaces are protected by RCU
331 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
332 struct ieee80211_if_ap *ap;
333 if (sdata->vif.type != NL80211_IFTYPE_AP)
336 skb = skb_dequeue(&ap->ps_bc_buf);
341 total += skb_queue_len(&ap->ps_bc_buf);
344 list_for_each_entry_rcu(sta, &local->sta_list, list) {
345 skb = skb_dequeue(&sta->ps_tx_buf);
350 total += skb_queue_len(&sta->ps_tx_buf);
355 local->total_ps_buffered = total;
356 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
357 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
362 static ieee80211_tx_result
363 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
365 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
369 * broadcast/multicast frame
371 * If any of the associated stations is in power save mode,
372 * the frame is buffered to be sent after DTIM beacon frame.
373 * This is done either by the hardware or us.
376 /* powersaving STAs only in AP/VLAN mode */
380 /* no buffering for ordered frames */
381 if (ieee80211_has_order(hdr->frame_control))
384 /* no stations in PS mode */
385 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
388 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
390 /* device releases frame after DTIM beacon */
391 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
394 /* buffered in mac80211 */
395 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
396 purge_old_ps_buffers(tx->local);
398 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
399 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
401 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
404 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
406 tx->local->total_ps_buffered++;
408 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
413 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
416 if (!ieee80211_is_mgmt(fc))
419 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
422 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
429 static ieee80211_tx_result
430 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
432 struct sta_info *sta = tx->sta;
433 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
434 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
435 struct ieee80211_local *local = tx->local;
439 ieee80211_is_probe_resp(hdr->frame_control) ||
440 ieee80211_is_auth(hdr->frame_control) ||
441 ieee80211_is_assoc_resp(hdr->frame_control) ||
442 ieee80211_is_reassoc_resp(hdr->frame_control)))
445 staflags = get_sta_flags(sta);
447 if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) &&
448 !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) {
449 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
450 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
452 sta->sta.addr, sta->sta.aid,
453 skb_queue_len(&sta->ps_tx_buf));
454 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
455 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
456 purge_old_ps_buffers(tx->local);
457 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
458 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
459 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
460 if (net_ratelimit()) {
461 printk(KERN_DEBUG "%s: STA %pM TX "
462 "buffer full - dropping oldest frame\n",
463 tx->sdata->name, sta->sta.addr);
468 tx->local->total_ps_buffered++;
471 * Queue frame to be sent after STA wakes up/polls,
472 * but don't set the TIM bit if the driver is blocking
473 * wakeup or poll response transmissions anyway.
475 if (skb_queue_empty(&sta->ps_tx_buf) &&
476 !(staflags & WLAN_STA_PS_DRIVER))
477 sta_info_set_tim_bit(sta);
479 info->control.jiffies = jiffies;
480 info->control.vif = &tx->sdata->vif;
481 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
482 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
484 if (!timer_pending(&local->sta_cleanup))
485 mod_timer(&local->sta_cleanup,
486 round_jiffies(jiffies +
487 STA_INFO_CLEANUP_INTERVAL));
491 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
492 else if (unlikely(staflags & WLAN_STA_PS_STA)) {
493 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
494 "set -> send frame\n", tx->sdata->name,
497 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
502 static ieee80211_tx_result debug_noinline
503 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
505 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
508 if (tx->flags & IEEE80211_TX_UNICAST)
509 return ieee80211_tx_h_unicast_ps_buf(tx);
511 return ieee80211_tx_h_multicast_ps_buf(tx);
514 static ieee80211_tx_result debug_noinline
515 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
517 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
519 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
520 tx->sdata->control_port_no_encrypt))
521 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
526 static ieee80211_tx_result debug_noinline
527 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
529 struct ieee80211_key *key = NULL;
530 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
531 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
533 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
535 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
537 else if (ieee80211_is_mgmt(hdr->frame_control) &&
538 is_multicast_ether_addr(hdr->addr1) &&
539 ieee80211_is_robust_mgmt_frame(hdr) &&
540 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
542 else if (is_multicast_ether_addr(hdr->addr1) &&
543 (key = rcu_dereference(tx->sdata->default_multicast_key)))
545 else if (!is_multicast_ether_addr(hdr->addr1) &&
546 (key = rcu_dereference(tx->sdata->default_unicast_key)))
548 else if (tx->sdata->drop_unencrypted &&
549 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
550 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
551 (!ieee80211_is_robust_mgmt_frame(hdr) ||
552 (ieee80211_is_action(hdr->frame_control) &&
553 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
554 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
560 bool skip_hw = false;
562 tx->key->tx_rx_count++;
563 /* TODO: add threshold stuff again */
565 switch (tx->key->conf.cipher) {
566 case WLAN_CIPHER_SUITE_WEP40:
567 case WLAN_CIPHER_SUITE_WEP104:
568 if (ieee80211_is_auth(hdr->frame_control))
570 case WLAN_CIPHER_SUITE_TKIP:
571 if (!ieee80211_is_data_present(hdr->frame_control))
574 case WLAN_CIPHER_SUITE_CCMP:
575 if (!ieee80211_is_data_present(hdr->frame_control) &&
576 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
580 skip_hw = (tx->key->conf.flags &
581 IEEE80211_KEY_FLAG_SW_MGMT) &&
582 ieee80211_is_mgmt(hdr->frame_control);
584 case WLAN_CIPHER_SUITE_AES_CMAC:
585 if (!ieee80211_is_mgmt(hdr->frame_control))
590 if (!skip_hw && tx->key &&
591 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
592 info->control.hw_key = &tx->key->conf;
598 static ieee80211_tx_result debug_noinline
599 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
601 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
602 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
603 struct ieee80211_supported_band *sband;
604 struct ieee80211_rate *rate;
607 bool inval = false, rts = false, short_preamble = false;
608 struct ieee80211_tx_rate_control txrc;
611 memset(&txrc, 0, sizeof(txrc));
613 sband = tx->local->hw.wiphy->bands[tx->channel->band];
615 len = min_t(u32, tx->skb->len + FCS_LEN,
616 tx->local->hw.wiphy->frag_threshold);
618 /* set up the tx rate control struct we give the RC algo */
619 txrc.hw = local_to_hw(tx->local);
621 txrc.bss_conf = &tx->sdata->vif.bss_conf;
623 txrc.reported_rate.idx = -1;
624 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
625 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
626 txrc.max_rate_idx = -1;
628 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
629 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
630 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
632 /* set up RTS protection if desired */
633 if (len > tx->local->hw.wiphy->rts_threshold) {
634 txrc.rts = rts = true;
638 * Use short preamble if the BSS can handle it, but not for
639 * management frames unless we know the receiver can handle
640 * that -- the management frame might be to a station that
641 * just wants a probe response.
643 if (tx->sdata->vif.bss_conf.use_short_preamble &&
644 (ieee80211_is_data(hdr->frame_control) ||
645 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
646 txrc.short_preamble = short_preamble = true;
648 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
651 * Lets not bother rate control if we're associated and cannot
652 * talk to the sta. This should not happen.
654 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
655 (sta_flags & WLAN_STA_ASSOC) &&
656 !rate_usable_index_exists(sband, &tx->sta->sta),
657 "%s: Dropped data frame as no usable bitrate found while "
658 "scanning and associated. Target station: "
659 "%pM on %d GHz band\n",
660 tx->sdata->name, hdr->addr1,
661 tx->channel->band ? 5 : 2))
665 * If we're associated with the sta at this point we know we can at
666 * least send the frame at the lowest bit rate.
668 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
670 if (unlikely(info->control.rates[0].idx < 0))
673 if (txrc.reported_rate.idx < 0) {
674 txrc.reported_rate = info->control.rates[0];
675 if (tx->sta && ieee80211_is_data(hdr->frame_control))
676 tx->sta->last_tx_rate = txrc.reported_rate;
678 tx->sta->last_tx_rate = txrc.reported_rate;
680 if (unlikely(!info->control.rates[0].count))
681 info->control.rates[0].count = 1;
683 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
684 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
685 info->control.rates[0].count = 1;
687 if (is_multicast_ether_addr(hdr->addr1)) {
689 * XXX: verify the rate is in the basic rateset
695 * set up the RTS/CTS rate as the fastest basic rate
696 * that is not faster than the data rate
698 * XXX: Should this check all retry rates?
700 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
703 rate = &sband->bitrates[info->control.rates[0].idx];
705 for (i = 0; i < sband->n_bitrates; i++) {
706 /* must be a basic rate */
707 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
709 /* must not be faster than the data rate */
710 if (sband->bitrates[i].bitrate > rate->bitrate)
713 if (sband->bitrates[baserate].bitrate <
714 sband->bitrates[i].bitrate)
718 info->control.rts_cts_rate_idx = baserate;
721 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
723 * make sure there's no valid rate following
724 * an invalid one, just in case drivers don't
725 * take the API seriously to stop at -1.
728 info->control.rates[i].idx = -1;
731 if (info->control.rates[i].idx < 0) {
737 * For now assume MCS is already set up correctly, this
740 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
741 WARN_ON(info->control.rates[i].idx > 76);
745 /* set up RTS protection if desired */
747 info->control.rates[i].flags |=
748 IEEE80211_TX_RC_USE_RTS_CTS;
751 if (WARN_ON_ONCE(info->control.rates[i].idx >=
752 sband->n_bitrates)) {
753 info->control.rates[i].idx = -1;
757 rate = &sband->bitrates[info->control.rates[i].idx];
759 /* set up short preamble */
760 if (short_preamble &&
761 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
762 info->control.rates[i].flags |=
763 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
765 /* set up G protection */
766 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
767 rate->flags & IEEE80211_RATE_ERP_G)
768 info->control.rates[i].flags |=
769 IEEE80211_TX_RC_USE_CTS_PROTECT;
775 static ieee80211_tx_result debug_noinline
776 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
778 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
779 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
785 * Packet injection may want to control the sequence
786 * number, if we have no matching interface then we
787 * neither assign one ourselves nor ask the driver to.
789 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
792 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
795 if (ieee80211_hdrlen(hdr->frame_control) < 24)
799 * Anything but QoS data that has a sequence number field
800 * (is long enough) gets a sequence number from the global
803 if (!ieee80211_is_data_qos(hdr->frame_control)) {
804 /* driver should assign sequence number */
805 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
806 /* for pure STA mode without beacons, we can do it */
807 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
808 tx->sdata->sequence_number += 0x10;
813 * This should be true for injected/management frames only, for
814 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
815 * above since they are not QoS-data frames.
820 /* include per-STA, per-TID sequence counter */
822 qc = ieee80211_get_qos_ctl(hdr);
823 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
824 seq = &tx->sta->tid_seq[tid];
826 hdr->seq_ctrl = cpu_to_le16(*seq);
828 /* Increase the sequence number. */
829 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
834 static int ieee80211_fragment(struct ieee80211_local *local,
835 struct sk_buff *skb, int hdrlen,
838 struct sk_buff *tail = skb, *tmp;
839 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
840 int pos = hdrlen + per_fragm;
841 int rem = skb->len - hdrlen - per_fragm;
843 if (WARN_ON(rem < 0))
847 int fraglen = per_fragm;
852 tmp = dev_alloc_skb(local->tx_headroom +
854 IEEE80211_ENCRYPT_HEADROOM +
855 IEEE80211_ENCRYPT_TAILROOM);
860 skb_reserve(tmp, local->tx_headroom +
861 IEEE80211_ENCRYPT_HEADROOM);
862 /* copy control information */
863 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
864 skb_copy_queue_mapping(tmp, skb);
865 tmp->priority = skb->priority;
868 /* copy header and data */
869 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
870 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
875 skb->len = hdrlen + per_fragm;
879 static ieee80211_tx_result debug_noinline
880 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
882 struct sk_buff *skb = tx->skb;
883 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
884 struct ieee80211_hdr *hdr = (void *)skb->data;
885 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
889 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
893 * Warn when submitting a fragmented A-MPDU frame and drop it.
894 * This scenario is handled in ieee80211_tx_prepare but extra
895 * caution taken here as fragmented ampdu may cause Tx stop.
897 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
900 hdrlen = ieee80211_hdrlen(hdr->frame_control);
902 /* internal error, why is TX_FRAGMENTED set? */
903 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
907 * Now fragment the frame. This will allocate all the fragments and
908 * chain them (using skb as the first fragment) to skb->next.
909 * During transmission, we will remove the successfully transmitted
910 * fragments from this list. When the low-level driver rejects one
911 * of the fragments then we will simply pretend to accept the skb
912 * but store it away as pending.
914 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
917 /* update duration/seq/flags of fragments */
921 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
923 hdr = (void *)skb->data;
924 info = IEEE80211_SKB_CB(skb);
927 hdr->frame_control |= morefrags;
928 next_len = skb->next->len;
930 * No multi-rate retries for fragmented frames, that
931 * would completely throw off the NAV at other STAs.
933 info->control.rates[1].idx = -1;
934 info->control.rates[2].idx = -1;
935 info->control.rates[3].idx = -1;
936 info->control.rates[4].idx = -1;
937 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
938 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
940 hdr->frame_control &= ~morefrags;
943 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
944 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
946 } while ((skb = skb->next));
951 static ieee80211_tx_result debug_noinline
952 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
954 struct sk_buff *skb = tx->skb;
959 tx->sta->tx_packets++;
961 tx->sta->tx_fragments++;
962 tx->sta->tx_bytes += skb->len;
963 } while ((skb = skb->next));
968 static ieee80211_tx_result debug_noinline
969 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
971 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
976 switch (tx->key->conf.cipher) {
977 case WLAN_CIPHER_SUITE_WEP40:
978 case WLAN_CIPHER_SUITE_WEP104:
979 return ieee80211_crypto_wep_encrypt(tx);
980 case WLAN_CIPHER_SUITE_TKIP:
981 return ieee80211_crypto_tkip_encrypt(tx);
982 case WLAN_CIPHER_SUITE_CCMP:
983 return ieee80211_crypto_ccmp_encrypt(tx);
984 case WLAN_CIPHER_SUITE_AES_CMAC:
985 return ieee80211_crypto_aes_cmac_encrypt(tx);
987 /* handle hw-only algorithm */
988 if (info->control.hw_key) {
989 ieee80211_tx_set_protected(tx);
999 static ieee80211_tx_result debug_noinline
1000 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1002 struct sk_buff *skb = tx->skb;
1003 struct ieee80211_hdr *hdr;
1008 hdr = (void *) skb->data;
1009 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1010 break; /* must not overwrite AID */
1011 next_len = skb->next ? skb->next->len : 0;
1012 group_addr = is_multicast_ether_addr(hdr->addr1);
1015 ieee80211_duration(tx, group_addr, next_len);
1016 } while ((skb = skb->next));
1021 /* actual transmit path */
1024 * deal with packet injection down monitor interface
1025 * with Radiotap Header -- only called for monitor mode interface
1027 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
1028 struct sk_buff *skb)
1031 * this is the moment to interpret and discard the radiotap header that
1032 * must be at the start of the packet injected in Monitor mode
1034 * Need to take some care with endian-ness since radiotap
1035 * args are little-endian
1038 struct ieee80211_radiotap_iterator iterator;
1039 struct ieee80211_radiotap_header *rthdr =
1040 (struct ieee80211_radiotap_header *) skb->data;
1041 struct ieee80211_supported_band *sband;
1043 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1044 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1047 sband = tx->local->hw.wiphy->bands[tx->channel->band];
1049 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1050 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1052 /* packet is fragmented in HW if we have a non-NULL driver callback */
1053 hw_frag = (tx->local->ops->set_frag_threshold != NULL);
1056 * for every radiotap entry that is present
1057 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1058 * entries present, or -EINVAL on error)
1062 ret = ieee80211_radiotap_iterator_next(&iterator);
1067 /* see if this argument is something we can use */
1068 switch (iterator.this_arg_index) {
1070 * You must take care when dereferencing iterator.this_arg
1071 * for multibyte types... the pointer is not aligned. Use
1072 * get_unaligned((type *)iterator.this_arg) to dereference
1073 * iterator.this_arg for type "type" safely on all arches.
1075 case IEEE80211_RADIOTAP_FLAGS:
1076 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1078 * this indicates that the skb we have been
1079 * handed has the 32-bit FCS CRC at the end...
1080 * we should react to that by snipping it off
1081 * because it will be recomputed and added
1084 if (skb->len < (iterator._max_length + FCS_LEN))
1087 skb_trim(skb, skb->len - FCS_LEN);
1089 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1090 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1091 if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) &&
1093 tx->flags |= IEEE80211_TX_FRAGMENTED;
1097 * Please update the file
1098 * Documentation/networking/mac80211-injection.txt
1099 * when parsing new fields here.
1107 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1111 * remove the radiotap header
1112 * iterator->_max_length was sanity-checked against
1113 * skb->len by iterator init
1115 skb_pull(skb, iterator._max_length);
1120 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1121 struct sk_buff *skb,
1122 struct ieee80211_tx_info *info,
1123 struct tid_ampdu_tx *tid_tx,
1126 bool queued = false;
1128 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1129 info->flags |= IEEE80211_TX_CTL_AMPDU;
1130 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1132 * nothing -- this aggregation session is being started
1133 * but that might still fail with the driver
1136 spin_lock(&tx->sta->lock);
1138 * Need to re-check now, because we may get here
1140 * 1) in the window during which the setup is actually
1141 * already done, but not marked yet because not all
1142 * packets are spliced over to the driver pending
1143 * queue yet -- if this happened we acquire the lock
1144 * either before or after the splice happens, but
1145 * need to recheck which of these cases happened.
1147 * 2) during session teardown, if the OPERATIONAL bit
1148 * was cleared due to the teardown but the pointer
1149 * hasn't been assigned NULL yet (or we loaded it
1150 * before it was assigned) -- in this case it may
1151 * now be NULL which means we should just let the
1152 * packet pass through because splicing the frames
1153 * back is already done.
1155 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
1158 /* do nothing, let packet pass through */
1159 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1160 info->flags |= IEEE80211_TX_CTL_AMPDU;
1163 info->control.vif = &tx->sdata->vif;
1164 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1165 __skb_queue_tail(&tid_tx->pending, skb);
1167 spin_unlock(&tx->sta->lock);
1176 static ieee80211_tx_result
1177 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1178 struct ieee80211_tx_data *tx,
1179 struct sk_buff *skb)
1181 struct ieee80211_local *local = sdata->local;
1182 struct ieee80211_hdr *hdr;
1183 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1187 memset(tx, 0, sizeof(*tx));
1191 tx->channel = local->hw.conf.channel;
1193 * Set this flag (used below to indicate "automatic fragmentation"),
1194 * it will be cleared/left by radiotap as desired.
1195 * Only valid when fragmentation is done by the stack.
1197 if (!local->ops->set_frag_threshold)
1198 tx->flags |= IEEE80211_TX_FRAGMENTED;
1200 /* process and remove the injection radiotap header */
1201 if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1202 if (!__ieee80211_parse_tx_radiotap(tx, skb))
1206 * __ieee80211_parse_tx_radiotap has now removed
1207 * the radiotap header that was present and pre-filled
1208 * 'tx' with tx control information.
1210 info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1214 * If this flag is set to true anywhere, and we get here,
1215 * we are doing the needed processing, so remove the flag
1218 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1220 hdr = (struct ieee80211_hdr *) skb->data;
1222 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1223 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1224 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1226 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1227 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1230 tx->sta = sta_info_get(sdata, hdr->addr1);
1232 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1233 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
1234 struct tid_ampdu_tx *tid_tx;
1236 qc = ieee80211_get_qos_ctl(hdr);
1237 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1239 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1243 queued = ieee80211_tx_prep_agg(tx, skb, info,
1246 if (unlikely(queued))
1251 if (is_multicast_ether_addr(hdr->addr1)) {
1252 tx->flags &= ~IEEE80211_TX_UNICAST;
1253 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1255 tx->flags |= IEEE80211_TX_UNICAST;
1256 if (unlikely(local->wifi_wme_noack_test))
1257 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1259 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1262 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1263 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1264 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1265 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1266 tx->flags |= IEEE80211_TX_FRAGMENTED;
1268 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1272 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1273 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1274 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1276 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1277 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1278 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1279 tx->ethertype = (pos[0] << 8) | pos[1];
1281 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1286 static int __ieee80211_tx(struct ieee80211_local *local,
1287 struct sk_buff **skbp,
1288 struct sta_info *sta,
1291 struct sk_buff *skb = *skbp, *next;
1292 struct ieee80211_tx_info *info;
1293 struct ieee80211_sub_if_data *sdata;
1294 unsigned long flags;
1299 int q = skb_get_queue_mapping(skb);
1302 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1303 ret = IEEE80211_TX_OK;
1304 if (local->queue_stop_reasons[q] ||
1305 (!txpending && !skb_queue_empty(&local->pending[q])))
1306 ret = IEEE80211_TX_PENDING;
1307 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1308 if (ret != IEEE80211_TX_OK)
1311 info = IEEE80211_SKB_CB(skb);
1314 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1315 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1321 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
1323 sdata = vif_to_sdata(info->control.vif);
1325 switch (sdata->vif.type) {
1326 case NL80211_IFTYPE_MONITOR:
1327 info->control.vif = NULL;
1329 case NL80211_IFTYPE_AP_VLAN:
1330 info->control.vif = &container_of(sdata->bss,
1331 struct ieee80211_sub_if_data, u.ap)->vif;
1338 if (sta && sta->uploaded)
1339 info->control.sta = &sta->sta;
1341 info->control.sta = NULL;
1343 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1344 ret = drv_tx(local, skb);
1345 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
1349 if (ret != NETDEV_TX_OK) {
1350 info->control.vif = &sdata->vif;
1351 return IEEE80211_TX_AGAIN;
1354 ieee80211_tpt_led_trig_tx(local, fc, len);
1356 ieee80211_led_tx(local, 1);
1360 return IEEE80211_TX_OK;
1364 * Invoke TX handlers, return 0 on success and non-zero if the
1365 * frame was dropped or queued.
1367 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1369 struct sk_buff *skb = tx->skb;
1370 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1371 ieee80211_tx_result res = TX_DROP;
1373 #define CALL_TXH(txh) \
1376 if (res != TX_CONTINUE) \
1380 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1381 CALL_TXH(ieee80211_tx_h_check_assoc);
1382 CALL_TXH(ieee80211_tx_h_ps_buf);
1383 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1384 CALL_TXH(ieee80211_tx_h_select_key);
1385 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1386 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1388 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
1391 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1392 CALL_TXH(ieee80211_tx_h_sequence);
1393 CALL_TXH(ieee80211_tx_h_fragment);
1394 /* handlers after fragment must be aware of tx info fragmentation! */
1395 CALL_TXH(ieee80211_tx_h_stats);
1396 CALL_TXH(ieee80211_tx_h_encrypt);
1397 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1398 CALL_TXH(ieee80211_tx_h_calculate_duration);
1402 if (unlikely(res == TX_DROP)) {
1403 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1405 struct sk_buff *next;
1412 } else if (unlikely(res == TX_QUEUED)) {
1413 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1420 static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1421 struct sk_buff *skb, bool txpending)
1423 struct ieee80211_local *local = sdata->local;
1424 struct ieee80211_tx_data tx;
1425 ieee80211_tx_result res_prepare;
1426 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1427 struct sk_buff *next;
1428 unsigned long flags;
1432 queue = skb_get_queue_mapping(skb);
1434 if (unlikely(skb->len < 10)) {
1441 /* initialises tx */
1442 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1444 if (unlikely(res_prepare == TX_DROP)) {
1448 } else if (unlikely(res_prepare == TX_QUEUED)) {
1453 tx.channel = local->hw.conf.channel;
1454 info->band = tx.channel->band;
1456 if (invoke_tx_handlers(&tx))
1461 ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1463 case IEEE80211_TX_OK:
1465 case IEEE80211_TX_AGAIN:
1467 * Since there are no fragmented frames on A-MPDU
1468 * queues, there's no reason for a driver to reject
1469 * a frame there, warn and drop it.
1471 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1474 case IEEE80211_TX_PENDING:
1477 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1479 if (local->queue_stop_reasons[queue] ||
1480 !skb_queue_empty(&local->pending[queue])) {
1482 * if queue is stopped, queue up frames for later
1483 * transmission from the tasklet
1488 if (unlikely(txpending))
1489 __skb_queue_head(&local->pending[queue],
1492 __skb_queue_tail(&local->pending[queue],
1494 } while ((skb = next));
1496 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1500 * otherwise retry, but this is a race condition or
1501 * a driver bug (which we warn about if it persists)
1503 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1507 if (WARN(retries > 10, "tx refused but queue active\n"))
1527 /* device xmit handlers */
1529 static int ieee80211_skb_resize(struct ieee80211_local *local,
1530 struct sk_buff *skb,
1531 int head_need, bool may_encrypt)
1536 * This could be optimised, devices that do full hardware
1537 * crypto (including TKIP MMIC) need no tailroom... But we
1538 * have no drivers for such devices currently.
1541 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1542 tail_need -= skb_tailroom(skb);
1543 tail_need = max_t(int, tail_need, 0);
1546 if (head_need || tail_need) {
1547 /* Sorry. Can't account for this any more */
1551 if (skb_header_cloned(skb))
1552 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1553 else if (head_need || tail_need)
1554 I802_DEBUG_INC(local->tx_expand_skb_head);
1558 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1559 wiphy_debug(local->hw.wiphy,
1560 "failed to reallocate TX buffer\n");
1564 /* update truesize too */
1565 skb->truesize += head_need + tail_need;
1570 static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1571 struct sk_buff *skb)
1573 struct ieee80211_local *local = sdata->local;
1574 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1575 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1576 struct ieee80211_sub_if_data *tmp_sdata;
1582 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1586 info->flags |= IEEE80211_TX_CTL_INJECTED |
1587 IEEE80211_TX_INTFL_HAS_RADIOTAP;
1589 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1590 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1591 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1593 /* check the header is complete in the frame */
1594 if (likely(skb->len >= len_rthdr + hdrlen)) {
1596 * We process outgoing injected frames that have a
1597 * local address we handle as though they are our
1599 * This code here isn't entirely correct, the local
1600 * MAC address is not necessarily enough to find
1601 * the interface to use; for that proper VLAN/WDS
1602 * support we will need a different mechanism.
1605 list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1607 if (!ieee80211_sdata_running(tmp_sdata))
1609 if (tmp_sdata->vif.type ==
1610 NL80211_IFTYPE_MONITOR ||
1611 tmp_sdata->vif.type ==
1612 NL80211_IFTYPE_AP_VLAN ||
1613 tmp_sdata->vif.type ==
1616 if (compare_ether_addr(tmp_sdata->vif.addr,
1625 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1627 headroom = local->tx_headroom;
1629 headroom += IEEE80211_ENCRYPT_HEADROOM;
1630 headroom -= skb_headroom(skb);
1631 headroom = max_t(int, 0, headroom);
1633 if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1639 hdr = (struct ieee80211_hdr *) skb->data;
1640 info->control.vif = &sdata->vif;
1642 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1643 ieee80211_is_data(hdr->frame_control) &&
1644 !is_multicast_ether_addr(hdr->addr1))
1645 if (mesh_nexthop_lookup(skb, sdata)) {
1646 /* skb queued: don't free */
1651 ieee80211_set_qos_hdr(local, skb);
1652 ieee80211_tx(sdata, skb, false);
1656 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1657 struct net_device *dev)
1659 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1660 struct ieee80211_channel *chan = local->hw.conf.channel;
1661 struct ieee80211_radiotap_header *prthdr =
1662 (struct ieee80211_radiotap_header *)skb->data;
1663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1667 * Frame injection is not allowed if beaconing is not allowed
1668 * or if we need radar detection. Beaconing is usually not allowed when
1669 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1670 * Passive scan is also used in world regulatory domains where
1671 * your country is not known and as such it should be treated as
1672 * NO TX unless the channel is explicitly allowed in which case
1673 * your current regulatory domain would not have the passive scan
1676 * Since AP mode uses monitor interfaces to inject/TX management
1677 * frames we can make AP mode the exception to this rule once it
1678 * supports radar detection as its implementation can deal with
1679 * radar detection by itself. We can do that later by adding a
1680 * monitor flag interfaces used for AP support.
1682 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1683 IEEE80211_CHAN_PASSIVE_SCAN)))
1686 /* check for not even having the fixed radiotap header part */
1687 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1688 goto fail; /* too short to be possibly valid */
1690 /* is it a header version we can trust to find length from? */
1691 if (unlikely(prthdr->it_version))
1692 goto fail; /* only version 0 is supported */
1694 /* then there must be a radiotap header with a length we can use */
1695 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1697 /* does the skb contain enough to deliver on the alleged length? */
1698 if (unlikely(skb->len < len_rthdr))
1699 goto fail; /* skb too short for claimed rt header extent */
1702 * fix up the pointers accounting for the radiotap
1703 * header still being in there. We are being given
1704 * a precooked IEEE80211 header so no need for
1707 skb_set_mac_header(skb, len_rthdr);
1709 * these are just fixed to the end of the rt area since we
1710 * don't have any better information and at this point, nobody cares
1712 skb_set_network_header(skb, len_rthdr);
1713 skb_set_transport_header(skb, len_rthdr);
1715 memset(info, 0, sizeof(*info));
1717 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1719 /* pass the radiotap header up to xmit */
1720 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1721 return NETDEV_TX_OK;
1725 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1729 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1730 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1731 * @skb: packet to be sent
1732 * @dev: incoming interface
1734 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1735 * not be freed, and caller is responsible for either retrying later or freeing
1738 * This function takes in an Ethernet header and encapsulates it with suitable
1739 * IEEE 802.11 header based on which interface the packet is coming in. The
1740 * encapsulated packet will then be passed to master interface, wlan#.11, for
1741 * transmission (through low-level driver).
1743 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1744 struct net_device *dev)
1746 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1747 struct ieee80211_local *local = sdata->local;
1748 struct ieee80211_tx_info *info;
1749 int ret = NETDEV_TX_BUSY, head_need;
1750 u16 ethertype, hdrlen, meshhdrlen = 0;
1752 struct ieee80211_hdr hdr;
1753 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1754 struct mesh_path __maybe_unused *mppath = NULL;
1755 const u8 *encaps_data;
1756 int encaps_len, skip_header_bytes;
1758 struct sta_info *sta = NULL;
1760 struct sk_buff *tmp_skb;
1762 if (unlikely(skb->len < ETH_HLEN)) {
1767 /* convert Ethernet header to proper 802.11 header (based on
1768 * operation mode) */
1769 ethertype = (skb->data[12] << 8) | skb->data[13];
1770 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1772 switch (sdata->vif.type) {
1773 case NL80211_IFTYPE_AP_VLAN:
1775 sta = rcu_dereference(sdata->u.vlan.sta);
1777 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1779 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1780 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1781 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1782 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1784 sta_flags = get_sta_flags(sta);
1790 case NL80211_IFTYPE_AP:
1791 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1793 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1794 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1795 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1798 case NL80211_IFTYPE_WDS:
1799 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1801 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1802 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1803 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1804 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1807 #ifdef CONFIG_MAC80211_MESH
1808 case NL80211_IFTYPE_MESH_POINT:
1809 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1810 /* Do not send frames with mesh_ttl == 0 */
1811 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1815 if (!is_multicast_ether_addr(skb->data))
1816 mppath = mpp_path_lookup(skb->data, sdata);
1819 * Use address extension if it is a packet from
1820 * another interface or if we know the destination
1821 * is being proxied by a portal (i.e. portal address
1822 * differs from proxied address)
1824 if (compare_ether_addr(sdata->vif.addr,
1825 skb->data + ETH_ALEN) == 0 &&
1826 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1827 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1828 skb->data, skb->data + ETH_ALEN);
1829 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1832 int is_mesh_mcast = 1;
1836 if (is_multicast_ether_addr(skb->data))
1837 /* DA TA mSA AE:SA */
1838 mesh_da = skb->data;
1840 static const u8 bcast[ETH_ALEN] =
1841 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1843 /* RA TA mDA mSA AE:DA SA */
1844 mesh_da = mppath->mpp;
1847 /* DA TA mSA AE:SA */
1851 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1852 mesh_da, sdata->vif.addr);
1856 ieee80211_new_mesh_header(&mesh_hdr,
1858 skb->data + ETH_ALEN,
1862 ieee80211_new_mesh_header(&mesh_hdr,
1865 skb->data + ETH_ALEN);
1870 case NL80211_IFTYPE_STATION:
1871 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1872 if (sdata->u.mgd.use_4addr &&
1873 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1874 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1876 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1877 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1878 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1881 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1883 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1884 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1888 case NL80211_IFTYPE_ADHOC:
1890 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1891 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1892 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1901 * There's no need to try to look up the destination
1902 * if it is a multicast address (which can only happen
1905 if (!is_multicast_ether_addr(hdr.addr1)) {
1907 sta = sta_info_get(sdata, hdr.addr1);
1909 sta_flags = get_sta_flags(sta);
1913 /* receiver and we are QoS enabled, use a QoS type frame */
1914 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1915 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1920 * Drop unicast frames to unauthorised stations unless they are
1921 * EAPOL frames from the local station.
1923 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1924 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1925 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1926 !(cpu_to_be16(ethertype) == sdata->control_port_protocol &&
1927 compare_ether_addr(sdata->vif.addr,
1928 skb->data + ETH_ALEN) == 0))) {
1929 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1930 if (net_ratelimit())
1931 printk(KERN_DEBUG "%s: dropped frame to %pM"
1932 " (unauthorized port)\n", dev->name,
1936 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1943 * If the skb is shared we need to obtain our own copy.
1945 if (skb_shared(skb)) {
1947 skb = skb_clone(skb, GFP_ATOMIC);
1956 hdr.frame_control = fc;
1957 hdr.duration_id = 0;
1960 skip_header_bytes = ETH_HLEN;
1961 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1962 encaps_data = bridge_tunnel_header;
1963 encaps_len = sizeof(bridge_tunnel_header);
1964 skip_header_bytes -= 2;
1965 } else if (ethertype >= 0x600) {
1966 encaps_data = rfc1042_header;
1967 encaps_len = sizeof(rfc1042_header);
1968 skip_header_bytes -= 2;
1974 nh_pos = skb_network_header(skb) - skb->data;
1975 h_pos = skb_transport_header(skb) - skb->data;
1977 skb_pull(skb, skip_header_bytes);
1978 nh_pos -= skip_header_bytes;
1979 h_pos -= skip_header_bytes;
1981 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1984 * So we need to modify the skb header and hence need a copy of
1985 * that. The head_need variable above doesn't, so far, include
1986 * the needed header space that we don't need right away. If we
1987 * can, then we don't reallocate right now but only after the
1988 * frame arrives at the master device (if it does...)
1990 * If we cannot, however, then we will reallocate to include all
1991 * the ever needed space. Also, if we need to reallocate it anyway,
1992 * make it big enough for everything we may ever need.
1995 if (head_need > 0 || skb_cloned(skb)) {
1996 head_need += IEEE80211_ENCRYPT_HEADROOM;
1997 head_need += local->tx_headroom;
1998 head_need = max_t(int, 0, head_need);
1999 if (ieee80211_skb_resize(local, skb, head_need, true))
2004 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2005 nh_pos += encaps_len;
2006 h_pos += encaps_len;
2009 #ifdef CONFIG_MAC80211_MESH
2010 if (meshhdrlen > 0) {
2011 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2012 nh_pos += meshhdrlen;
2013 h_pos += meshhdrlen;
2017 if (ieee80211_is_data_qos(fc)) {
2018 __le16 *qos_control;
2020 qos_control = (__le16*) skb_push(skb, 2);
2021 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2023 * Maybe we could actually set some fields here, for now just
2024 * initialise to zero to indicate no special operation.
2028 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2033 dev->stats.tx_packets++;
2034 dev->stats.tx_bytes += skb->len;
2036 /* Update skb pointers to various headers since this modified frame
2037 * is going to go through Linux networking code that may potentially
2038 * need things like pointer to IP header. */
2039 skb_set_mac_header(skb, 0);
2040 skb_set_network_header(skb, nh_pos);
2041 skb_set_transport_header(skb, h_pos);
2043 info = IEEE80211_SKB_CB(skb);
2044 memset(info, 0, sizeof(*info));
2046 dev->trans_start = jiffies;
2047 ieee80211_xmit(sdata, skb);
2049 return NETDEV_TX_OK;
2052 if (ret == NETDEV_TX_OK)
2060 * ieee80211_clear_tx_pending may not be called in a context where
2061 * it is possible that it packets could come in again.
2063 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2067 for (i = 0; i < local->hw.queues; i++)
2068 skb_queue_purge(&local->pending[i]);
2071 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2072 struct sk_buff *skb)
2074 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2075 struct ieee80211_sub_if_data *sdata;
2076 struct sta_info *sta;
2077 struct ieee80211_hdr *hdr;
2081 sdata = vif_to_sdata(info->control.vif);
2083 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2084 ieee80211_tx(sdata, skb, true);
2086 hdr = (struct ieee80211_hdr *)skb->data;
2087 sta = sta_info_get(sdata, hdr->addr1);
2089 ret = __ieee80211_tx(local, &skb, sta, true);
2090 if (ret != IEEE80211_TX_OK)
2098 * Transmit all pending packets. Called from tasklet.
2100 void ieee80211_tx_pending(unsigned long data)
2102 struct ieee80211_local *local = (struct ieee80211_local *)data;
2103 struct ieee80211_sub_if_data *sdata;
2104 unsigned long flags;
2110 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2111 for (i = 0; i < local->hw.queues; i++) {
2113 * If queue is stopped by something other than due to pending
2114 * frames, or we have no pending frames, proceed to next queue.
2116 if (local->queue_stop_reasons[i] ||
2117 skb_queue_empty(&local->pending[i]))
2120 while (!skb_queue_empty(&local->pending[i])) {
2121 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2122 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2124 if (WARN_ON(!info->control.vif)) {
2129 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2132 txok = ieee80211_tx_pending_skb(local, skb);
2134 __skb_queue_head(&local->pending[i], skb);
2135 spin_lock_irqsave(&local->queue_stop_reason_lock,
2141 if (skb_queue_empty(&local->pending[i]))
2142 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2143 netif_wake_subqueue(sdata->dev, i);
2145 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2150 /* functions for drivers to get certain frames */
2152 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2153 struct sk_buff *skb,
2154 struct beacon_data *beacon)
2158 int i, have_bits = 0, n1, n2;
2160 /* Generate bitmap for TIM only if there are any STAs in power save
2162 if (atomic_read(&bss->num_sta_ps) > 0)
2163 /* in the hope that this is faster than
2164 * checking byte-for-byte */
2165 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2166 IEEE80211_MAX_AID+1);
2168 if (bss->dtim_count == 0)
2169 bss->dtim_count = beacon->dtim_period - 1;
2173 tim = pos = (u8 *) skb_put(skb, 6);
2174 *pos++ = WLAN_EID_TIM;
2176 *pos++ = bss->dtim_count;
2177 *pos++ = beacon->dtim_period;
2179 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2183 /* Find largest even number N1 so that bits numbered 1 through
2184 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2185 * (N2 + 1) x 8 through 2007 are 0. */
2187 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2194 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2201 /* Bitmap control */
2203 /* Part Virt Bitmap */
2204 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2206 tim[1] = n2 - n1 + 4;
2207 skb_put(skb, n2 - n1);
2209 *pos++ = aid0; /* Bitmap control */
2210 *pos++ = 0; /* Part Virt Bitmap */
2214 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2215 struct ieee80211_vif *vif,
2216 u16 *tim_offset, u16 *tim_length)
2218 struct ieee80211_local *local = hw_to_local(hw);
2219 struct sk_buff *skb = NULL;
2220 struct ieee80211_tx_info *info;
2221 struct ieee80211_sub_if_data *sdata = NULL;
2222 struct ieee80211_if_ap *ap = NULL;
2223 struct beacon_data *beacon;
2224 struct ieee80211_supported_band *sband;
2225 enum ieee80211_band band = local->hw.conf.channel->band;
2226 struct ieee80211_tx_rate_control txrc;
2228 sband = local->hw.wiphy->bands[band];
2232 sdata = vif_to_sdata(vif);
2234 if (!ieee80211_sdata_running(sdata))
2242 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2244 beacon = rcu_dereference(ap->beacon);
2247 * headroom, head length,
2248 * tail length and maximum TIM length
2250 skb = dev_alloc_skb(local->tx_headroom +
2252 beacon->tail_len + 256);
2256 skb_reserve(skb, local->tx_headroom);
2257 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2261 * Not very nice, but we want to allow the driver to call
2262 * ieee80211_beacon_get() as a response to the set_tim()
2263 * callback. That, however, is already invoked under the
2264 * sta_lock to guarantee consistent and race-free update
2265 * of the tim bitmap in mac80211 and the driver.
2267 if (local->tim_in_locked_section) {
2268 ieee80211_beacon_add_tim(ap, skb, beacon);
2270 unsigned long flags;
2272 spin_lock_irqsave(&local->sta_lock, flags);
2273 ieee80211_beacon_add_tim(ap, skb, beacon);
2274 spin_unlock_irqrestore(&local->sta_lock, flags);
2278 *tim_offset = beacon->head_len;
2280 *tim_length = skb->len - beacon->head_len;
2283 memcpy(skb_put(skb, beacon->tail_len),
2284 beacon->tail, beacon->tail_len);
2287 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2288 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2289 struct ieee80211_hdr *hdr;
2290 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2295 skb = skb_copy(presp, GFP_ATOMIC);
2299 hdr = (struct ieee80211_hdr *) skb->data;
2300 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2301 IEEE80211_STYPE_BEACON);
2302 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2303 struct ieee80211_mgmt *mgmt;
2306 #ifdef CONFIG_MAC80211_MESH
2307 if (!sdata->u.mesh.mesh_id_len)
2311 /* headroom, head length, tail length and maximum TIM length */
2312 skb = dev_alloc_skb(local->tx_headroom + 400 +
2313 sdata->u.mesh.vendor_ie_len);
2317 skb_reserve(skb, local->hw.extra_tx_headroom);
2318 mgmt = (struct ieee80211_mgmt *)
2319 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2320 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2321 mgmt->frame_control =
2322 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2323 memset(mgmt->da, 0xff, ETH_ALEN);
2324 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2325 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2326 mgmt->u.beacon.beacon_int =
2327 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2328 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
2330 pos = skb_put(skb, 2);
2331 *pos++ = WLAN_EID_SSID;
2334 mesh_mgmt_ies_add(skb, sdata);
2340 info = IEEE80211_SKB_CB(skb);
2342 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2343 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2346 memset(&txrc, 0, sizeof(txrc));
2349 txrc.bss_conf = &sdata->vif.bss_conf;
2351 txrc.reported_rate.idx = -1;
2352 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2353 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2354 txrc.max_rate_idx = -1;
2356 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2358 rate_control_get_rate(sdata, NULL, &txrc);
2360 info->control.vif = vif;
2362 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2363 IEEE80211_TX_CTL_ASSIGN_SEQ |
2364 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2369 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2371 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2372 struct ieee80211_vif *vif)
2374 struct ieee80211_sub_if_data *sdata;
2375 struct ieee80211_if_managed *ifmgd;
2376 struct ieee80211_pspoll *pspoll;
2377 struct ieee80211_local *local;
2378 struct sk_buff *skb;
2380 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2383 sdata = vif_to_sdata(vif);
2384 ifmgd = &sdata->u.mgd;
2385 local = sdata->local;
2387 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2389 printk(KERN_DEBUG "%s: failed to allocate buffer for "
2390 "pspoll template\n", sdata->name);
2393 skb_reserve(skb, local->hw.extra_tx_headroom);
2395 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2396 memset(pspoll, 0, sizeof(*pspoll));
2397 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2398 IEEE80211_STYPE_PSPOLL);
2399 pspoll->aid = cpu_to_le16(ifmgd->aid);
2401 /* aid in PS-Poll has its two MSBs each set to 1 */
2402 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2404 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2405 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2409 EXPORT_SYMBOL(ieee80211_pspoll_get);
2411 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2412 struct ieee80211_vif *vif)
2414 struct ieee80211_hdr_3addr *nullfunc;
2415 struct ieee80211_sub_if_data *sdata;
2416 struct ieee80211_if_managed *ifmgd;
2417 struct ieee80211_local *local;
2418 struct sk_buff *skb;
2420 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2423 sdata = vif_to_sdata(vif);
2424 ifmgd = &sdata->u.mgd;
2425 local = sdata->local;
2427 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2429 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2430 "template\n", sdata->name);
2433 skb_reserve(skb, local->hw.extra_tx_headroom);
2435 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2437 memset(nullfunc, 0, sizeof(*nullfunc));
2438 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2439 IEEE80211_STYPE_NULLFUNC |
2440 IEEE80211_FCTL_TODS);
2441 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2442 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2443 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2447 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2449 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2450 struct ieee80211_vif *vif,
2451 const u8 *ssid, size_t ssid_len,
2452 const u8 *ie, size_t ie_len)
2454 struct ieee80211_sub_if_data *sdata;
2455 struct ieee80211_local *local;
2456 struct ieee80211_hdr_3addr *hdr;
2457 struct sk_buff *skb;
2461 sdata = vif_to_sdata(vif);
2462 local = sdata->local;
2463 ie_ssid_len = 2 + ssid_len;
2465 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2466 ie_ssid_len + ie_len);
2468 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
2469 "request template\n", sdata->name);
2473 skb_reserve(skb, local->hw.extra_tx_headroom);
2475 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2476 memset(hdr, 0, sizeof(*hdr));
2477 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2478 IEEE80211_STYPE_PROBE_REQ);
2479 memset(hdr->addr1, 0xff, ETH_ALEN);
2480 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2481 memset(hdr->addr3, 0xff, ETH_ALEN);
2483 pos = skb_put(skb, ie_ssid_len);
2484 *pos++ = WLAN_EID_SSID;
2487 memcpy(pos, ssid, ssid_len);
2491 pos = skb_put(skb, ie_len);
2492 memcpy(pos, ie, ie_len);
2497 EXPORT_SYMBOL(ieee80211_probereq_get);
2499 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2500 const void *frame, size_t frame_len,
2501 const struct ieee80211_tx_info *frame_txctl,
2502 struct ieee80211_rts *rts)
2504 const struct ieee80211_hdr *hdr = frame;
2506 rts->frame_control =
2507 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2508 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2510 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2511 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2513 EXPORT_SYMBOL(ieee80211_rts_get);
2515 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2516 const void *frame, size_t frame_len,
2517 const struct ieee80211_tx_info *frame_txctl,
2518 struct ieee80211_cts *cts)
2520 const struct ieee80211_hdr *hdr = frame;
2522 cts->frame_control =
2523 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2524 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2525 frame_len, frame_txctl);
2526 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2528 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2531 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2532 struct ieee80211_vif *vif)
2534 struct ieee80211_local *local = hw_to_local(hw);
2535 struct sk_buff *skb = NULL;
2536 struct sta_info *sta;
2537 struct ieee80211_tx_data tx;
2538 struct ieee80211_sub_if_data *sdata;
2539 struct ieee80211_if_ap *bss = NULL;
2540 struct beacon_data *beacon;
2541 struct ieee80211_tx_info *info;
2543 sdata = vif_to_sdata(vif);
2547 beacon = rcu_dereference(bss->beacon);
2549 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2552 if (bss->dtim_count != 0)
2553 goto out; /* send buffered bc/mc only after DTIM beacon */
2556 skb = skb_dequeue(&bss->ps_bc_buf);
2559 local->total_ps_buffered--;
2561 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2562 struct ieee80211_hdr *hdr =
2563 (struct ieee80211_hdr *) skb->data;
2564 /* more buffered multicast/broadcast frames ==> set
2565 * MoreData flag in IEEE 802.11 header to inform PS
2567 hdr->frame_control |=
2568 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2571 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2573 dev_kfree_skb_any(skb);
2576 info = IEEE80211_SKB_CB(skb);
2579 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2580 tx.channel = local->hw.conf.channel;
2581 info->band = tx.channel->band;
2583 if (invoke_tx_handlers(&tx))
2590 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2592 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
2594 skb_set_mac_header(skb, 0);
2595 skb_set_network_header(skb, 0);
2596 skb_set_transport_header(skb, 0);
2598 /* send all internal mgmt frames on VO */
2599 skb_set_queue_mapping(skb, 0);
2602 * The other path calling ieee80211_xmit is from the tasklet,
2603 * and while we can handle concurrent transmissions locking
2604 * requirements are that we do not come into tx with bhs on.
2607 ieee80211_xmit(sdata, skb);